Xbox Live Marketplace Arcade game won't work?

I went over to my friend's house last night, and I got on my live account and bought Castle Crashers, then I came home this morning, and it says that I only have the demo, when I know that I spent 1200 Microsoft Points last night. Anyone know what's wrong?
I kinda left something out. Srry people that answered already. I took my xbox over there to get a few updates, and I bought it while my Xbox was the one being used. And it still won't let me use it. Do I have to be connected to live to play it? My memory section on the Xbox also says that I have the full game on my hard drive, but it won't let me play it
 
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